The "vow" was positive; the "bond" negative or restrictive. By a vow a man engaged to dedicate something to God, or to accomplish some work for Him: by a bond he debarred himself from some privilege or enjoyment. A vow involved an obligation to do: a bond, an obligation to forbear doing.

If a man vow a vow - A vow is a religious promise made to God. Vows were of several kinds: -

1. Of abstinence or humiliation, see Numbers 30:13;

2. Of the Nazarite, see Numbers 6;

3. Of giving certain things or sacrifices to the Lord, Leviticus 7:16;

4. Of alms given to the poor, see Deuteronomy 23:21.

The law in this chapter must have been very useful, as it both prevented and annulled rash vows, and provided a proper sanction for the support and performance of those that were rationally and piously made. Besides, this law must have acted as a great preventive of lying and hypocrisy. If a vow was properly made, a man or woman was bound, under penalty of the displeasure of God, to fulfill it.

If a man vow a vow unto the Lord,.... Which must be in a thing that is lawful to be done, which is not contrary to the revealed will and mind of God, and which may tend to the glory of God, the honour of religion, the service of the sanctuary, the good of a man's self or of his neighbour; or in things purely indifferent, which may, or may not be done, without offence to God or man; as that he will not eat such a thing for such a time, or he will do this or the other thing, as Jarchi observes; who moreover says, that he may forbid himself what is forbidden, and forbid what is free and lawful; but he may not make free or lawful what is forbidden, that is, he may not vow to do a thing which is contrary to the law of God, such a vow will not stand: and he was to be of such an age before he could make a vow that would be valid; according to the Targum of Jonathan, he must be thirteen years of age; it is said in the Misnah (p),"a son of twelve years and one day, his vows are examined; a son of thirteen years and one day, his vows are firm, and they examine the whole thirteenth year before that time; although they say we know to whose name (or on whose account) we vow or consecrate, their vow is no vow, nor their consecration no consecration; but after that time, though they say we know not to whose name (or, on whose account) we vow or consecrate, their vow is a vow, and their consecration a consecration:"

or swear an oath to bind his soul with a bond; to his vow adds an oath for the greater confirmation of it, and to lay himself under the greater obligation to perform it:

he shall not break his word; or profane it (q) but punctually perform it; men should be careful how they vow, and not rashly do it; but when they have vowed, they ought to perform; see Ecclesiastes 5:4,

he shall do according to all that proceedeth out of his mouth; it is not in his power to revoke his vow or make it null: the Misnic doctors (r) say, a man can loose all vows, excepting his own. R. Judah says, not the vows of his wife, nor those which are between her and others; that is, as one of the commentators (s) explains it, such vows which are not made to afflict, or respect not fasting; but according to the Targum of Jonathan, though a man cannot loose his vows, or free himself from them, yet the sanhedrim, or court of judicature, can, or a wise man that is authenticated thereby, as Jarchi says, or three private persons; but these are such traditions; which make void the commandment of God, as our Lord complains, Matthew 15:1.

(p) Niddah, c. 5. sect. 6. (q) (r) Negaim, c. 5. sect. 5. (s) Bartenora in Misn. Negaim, c. 5. sect. 5.

At the head there stands the general rule, "If any one vow a vow to Jehovah, or swear an oath, to bind his soul to abstinence, he shall not break his word; he shall do according to all that has gone out of his mouth:" i.e., he shall keep or fulfil the vow, and the promise of abstinence, in perfect accordance with his word. נדר is a positive vow, or promise to give or sanctify any part of one's property to the Lord. אסּר, from אסר, to bind or fetter, the negative vow, or vow of abstinence. על־נפשׁו אסּר אסר, to take an abstinence upon his soul. In what such abstinence consisted is not explained, because it was well understood from traditional customs; in all probability it consisted chiefly in fasting and other similar abstinence from lawful things. The Nazarite's vow, which is generally reckoned among the vows of abstinence, is called neder in Numbers 6:2., not issar, because it consisted not merely in abstinence from the fruit of the vine, but also in the positive act of permitting the hair to grow freely in honour of the Lord. The expression "swear an oath" (Numbers 30:2; cf. Numbers 30:13) shows that, as a rule, they bound themselves to abstinence by an oath. The inf. constr., השּׁבא, is used here, as in other places, for the inf. abs. (cf. Ges. 131, 4, note 2). יחל, from חלל, for יחל, as in Ezekiel 39:7 (cf. Ges. 67, note 8), to desecrate (his word), i.e., to leave it unfulfilled or break it.

If a man vow a vow unto the LORD, or swear an oath to bind his soul with a bond; he shall not break his word, he shall do according to all that proceedeth out of his mouth.

break: Heb. profane

2. If a man vow a vow unto the Lord-A mere secret purpose of the mind was not enough to constitute a vow; it had to be actually expressed in words; and though a purely voluntary act, yet when once the vow was made, the performance of it, like that of every other promise, became an indispensable duty-all the more because, referring to a sacred thing, it could not be neglected without the guilt of prevarication and unfaithfulness to God.

he shall not break his word-literally, "profane his word"-render it vain and contemptible (Ps 55:20; 89:34). But as it would frequently happen that parties would vow to do things which were neither good in themselves nor in their power to perform, the law ordained that their natural superiors should have the right of judging as to the propriety of those vows, with discretionary power to sanction or interdict their fulfilment. Parents were to determine in the case of their children, and husbands in that of their wives-being, however, allowed only a day for deliberation after the matter became known to them; and their judgment, if unfavorable, released the devotee from all obligation [Nu 30:3-8].

30:1,2 No man can be bound by his own promise to do what he is already, by the Divine precept, forbidden to do. In other matters the command is, that he shall not break his words, through he may change his mind.